Calvin.My

Add or remove domain to existing Letsencrypt's cert

For installation via certbot

Snippet Nginx Config SSL Letsencrypt

Posted by Calvin Chieng on June 27, 2019, 16:03

Adding CORS header for specific domains in Nginx

Snippet Nginx Config Security

Posted by Calvin Chieng on June 27, 2019, 15:58

Clean-up inodes 100% usage caused by linux headers

In ubuntu 16.04

Error Ubuntu Linux Storage

Posted by Calvin Chieng on September 7, 2018, 18:16

Convert equirectangular panorama image into pannellum supported multi-resolution image

To support higher resolution 360 images on mobile device

Snippet Pannellum Panorama Image 360

Posted by Calvin Chieng on July 6, 2018, 17:29

Dynamically supply SMTP config in Rails

For multi-tenants system or user editable SMTP config

Snippet Rails ActionMailer SMTP

Posted by Calvin Chieng on June 30, 2018, 16:53

Read YAML file in Java

Convenience way to set configuration

Snippet Java YAML Jackson

Posted by Calvin Chieng on June 14, 2018, 13:44

Get and set json type data on html form in Rails

Via Activerecord and form helper

Guide Rails JSON Form

Posted by Calvin Chieng on May 31, 2018, 00:35

Changing the passenger max process

Adjust to balance the performance vs. resources

Guide Ruby Passenger Nginx

Posted by Calvin Chieng on May 22, 2018, 19:56

Increase file descriptor for RabbitMQ

For ubuntu 16.04

Snippet Ubuntu RabbitMQ Config

Posted by Calvin Chieng on May 16, 2018, 20:44

Using Active Storage for API project

With AWS S3 as storage service provider

Guide Rails Active Storage S3 AWS

Posted by Calvin Chieng on May 13, 2018, 15:30

Install new version of Ruby via rbenv

For mac and homebrew & For ubuntu

Snippet Ruby rbenv

Posted by Calvin Chieng on May 1, 2018, 22:52

Rails API Authentication

None, Basic, Token and ApiKey Authentication

Snippet Rails Authentication API

Posted by Calvin Chieng on April 10, 2018, 17:02

Nginx 1.13.9+ HTTP/2 server push

To reduce round trip time (RTT)

Guide Nginx HTTP2 Performance

Posted by Calvin Chieng on March 22, 2018, 23:34

Assets precompile fails because of insufficient memory

Fix it without buying more RAM

Error Rails Ubuntu

Posted by Calvin Chieng on March 22, 2018, 18:00

How to use yarn in Rails 5.1 to manage javascript dependencies?

Including steps to upgrade from older version of Rails

Guide Rails Javascript Yarn

Posted by Calvin Chieng on March 22, 2018, 17:10